Covering the 2SK2865, this 424 KB PDF sits in the schematic category but, judging by its name, is the component datasheet. No maker, revision or other details are present in the name. The 2SK prefix comes from the Japanese JIS/JEITA system and denotes an N-channel field-effect transistor. In repair work it is used to identify pins for meter testing, check voltage and current ratings when a stage has failed and select a suitable equivalent. Confirm the stamped marking matches before replacing anything.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.